CI failed four tests with "SystemExit: bench/models/paraphrase-multilingual-
MiniLM-L12-v2: model not downloaded". The claim those tests make is that the
joint ablation pass ranks exactly like the per-arm pass and that three arms
needing BM25 score the corpus once. That is a claim about the harness, not
about embedding quality, so it should not require a 470MB download to check.
The tests now inject a deterministic 384-dimensional stand-in dense model and
a stand-in cross-encoder at the seam both paths share. The real models still
carry every measurement in bench/reports; nothing measured changed.
Proven by the condition that broke: with both model directories moved out of
the tree, the whole suite passes (253 passed).
ZacharyZhang-NY
4b367cb59b